dpkg: package dependencies do not allow you to configure the joxi package:joxi depends on qtdeclarative5-qtquick2-plugin, however:The qtdeclarative5-qtquick2-plugin package is not installed.try to resolve the dependencies and get:

Package qtdeclarative5-qtquick2-plugin is not available but is referred to by another package.This may mean that the package is missing, has been obsoleted, oris only available from another sourceHowever, the following packages replace it:qml-module-qtquick2: i386 qml-module-qtquick2

You might want to look as some other screenshot tools that are in the repos already, such as shutter, or in outside repos that are known to be Debian-compatible. Currently some of us at MX-Linux are working with the ksnip (not a KDE app) developer in packaging and testing the next release, for example.

Debian Stable should not be combined with other releases. If you're trying to install software that isn't available in the current Debian Stable release, it's not a good idea to add repositories for other Debian releases. The problems might not happen right away, but the next time you install updates.

The reason things can break is because the software packaged for one Debian release is built to be compatible with the rest of the software for that release. For example, installing packages from buster on a stretch system could also install newer versions of core libraries including libc6. This results in a system that is not testing or stable but a broken mix of the two.

Repositories that can create a FrankenDebian if used with Debian Stable:

Debian testing release (currently buster)

Debian unstable release (also known as sid)

Ubuntu, Mint or other derivative repositories are not compatible with Debian! Ubuntu PPAs

After the update, there is a dependency problem.

This happens when some of the programs/packages are not from the Debianrepositories,...You could PM Bester69 he is a expert at working with strange brews, and frankie.